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  JS系列面试题
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  <h5 id="1-数据类型有哪些"><a href="#1-数据类型有哪些" class="headerlink" title="1. 数据类型有哪些"></a>1. 数据类型有哪些</h5><h5 id="2-For-of-和-for-in-的区别"><a href="#2-For-of-和-for-in-的区别" class="headerlink" title="2. For of 和 for in 的区别"></a>2. For of 和 for in 的区别</h5><h5 id="3-Map和-object-的区别有哪些，weakMap了解么，和Map区别是什么"><a href="#3-Map和-object-的区别有哪些，weakMap了解么，和Map区别是什么" class="headerlink" title="3. Map和 object 的区别有哪些，weakMap了解么，和Map区别是什么"></a>3. Map和 object 的区别有哪些，weakMap了解么，和Map区别是什么</h5><h5 id="4-为什么要进行垃圾回收，垃圾回收的原理"><a href="#4-为什么要进行垃圾回收，垃圾回收的原理" class="headerlink" title="4. 为什么要进行垃圾回收，垃圾回收的原理"></a>4. 为什么要进行垃圾回收，垃圾回收的原理</h5><h5 id="5-0-1-0-2等于0-3么，为什么不等，有什么好的处理办法么，10转成二进制怎么表示"><a href="#5-0-1-0-2等于0-3么，为什么不等，有什么好的处理办法么，10转成二进制怎么表示" class="headerlink" title="5. 0.1+0.2等于0.3么，为什么不等，有什么好的处理办法么，10转成二进制怎么表示"></a>5. 0.1+0.2等于0.3么，为什么不等，有什么好的处理办法么，10转成二进制怎么表示</h5><h5 id="6-继承有哪些方式，最有效是哪种，如何实现的"><a href="#6-继承有哪些方式，最有效是哪种，如何实现的" class="headerlink" title="6. 继承有哪些方式，最有效是哪种，如何实现的"></a>6. 继承有哪些方式，最有效是哪种，如何实现的</h5><h5 id="7-Var和let的区别有哪些-浏览器环境下-全局作用域的let和var-声明变量会挂载到-window上么-const的值可以修改么，为什么"><a href="#7-Var和let的区别有哪些-浏览器环境下-全局作用域的let和var-声明变量会挂载到-window上么-const的值可以修改么，为什么" class="headerlink" title="7. Var和let的区别有哪些, 浏览器环境下,全局作用域的let和var 声明变量会挂载到 window上么 ,const的值可以修改么，为什么"></a>7. Var和let的区别有哪些, 浏览器环境下,全局作用域的let和var 声明变量会挂载到 window上么 ,const的值可以修改么，为什么</h5><h5 id="8-Object-defineProperty的作用是什么，和proxy的区别"><a href="#8-Object-defineProperty的作用是什么，和proxy的区别" class="headerlink" title="8. Object.defineProperty的作用是什么，和proxy的区别"></a>8. Object.defineProperty的作用是什么，和proxy的区别</h5><h5 id="9-reduce用法"><a href="#9-reduce用法" class="headerlink" title="9. reduce用法"></a>9. reduce用法</h5><h5 id="10-防抖和节流使用场景"><a href="#10-防抖和节流使用场景" class="headerlink" title="10. 防抖和节流使用场景"></a>10. 防抖和节流使用场景</h5><span id="more"></span>
<h5 id="11-深拷贝"><a href="#11-深拷贝" class="headerlink" title="11. 深拷贝"></a>11. 深拷贝</h5><h5 id="12-javaScript-的事件循环（event-loop）"><a href="#12-javaScript-的事件循环（event-loop）" class="headerlink" title="12. javaScript 的事件循环（event loop）"></a>12. javaScript 的事件循环（event loop）</h5><h5 id="13-渲染几万条数据如何优化不卡住页面"><a href="#13-渲染几万条数据如何优化不卡住页面" class="headerlink" title="13. 渲染几万条数据如何优化不卡住页面"></a>13. 渲染几万条数据如何优化不卡住页面</h5><h5 id="14-普通函数和箭头函数的区别"><a href="#14-普通函数和箭头函数的区别" class="headerlink" title="14. 普通函数和箭头函数的区别"></a>14. 普通函数和箭头函数的区别</h5><h5 id="15-原型链"><a href="#15-原型链" class="headerlink" title="15. 原型链"></a>15. 原型链</h5><h5 id="16-js事件模型"><a href="#16-js事件模型" class="headerlink" title="16. js事件模型"></a>16. js事件模型</h5><h5 id="17-函数式编程理解"><a href="#17-函数式编程理解" class="headerlink" title="17. 函数式编程理解"></a>17. 函数式编程理解</h5><h5 id="18-闭包导致的内存泄漏怎么解决"><a href="#18-闭包导致的内存泄漏怎么解决" class="headerlink" title="18. 闭包导致的内存泄漏怎么解决"></a>18. 闭包导致的内存泄漏怎么解决</h5><h5 id="19-JSONP的原理"><a href="#19-JSONP的原理" class="headerlink" title="19. JSONP的原理"></a>19. JSONP的原理</h5><h5 id="20-promise为什么可以链式调用"><a href="#20-promise为什么可以链式调用" class="headerlink" title="20. promise为什么可以链式调用"></a>20. promise为什么可以链式调用</h5><h5 id="21-promise中resolve之后再reject，最终是什么状态"><a href="#21-promise中resolve之后再reject，最终是什么状态" class="headerlink" title="21. promise中resolve之后再reject，最终是什么状态"></a>21. promise中resolve之后再reject，最终是什么状态</h5><h5 id="22-跨域有什么解决方法？json-stringfy有什么类型不能用"><a href="#22-跨域有什么解决方法？json-stringfy有什么类型不能用" class="headerlink" title="22. 跨域有什么解决方法？json.stringfy有什么类型不能用"></a>22. 跨域有什么解决方法？json.stringfy有什么类型不能用</h5><h5 id="23-（es6）class继承"><a href="#23-（es6）class继承" class="headerlink" title="23. （es6）class继承"></a>23. （es6）class继承</h5><h5 id="24-（ts）什么是范型"><a href="#24-（ts）什么是范型" class="headerlink" title="24. （ts）什么是范型"></a>24. （ts）什么是范型</h5><h5 id="25-对柯里化函数的理解"><a href="#25-对柯里化函数的理解" class="headerlink" title="25. 对柯里化函数的理解"></a>25. 对柯里化函数的理解</h5><h5 id="26-面向对象特性"><a href="#26-面向对象特性" class="headerlink" title="26. 面向对象特性"></a>26. 面向对象特性</h5><h5 id="27-如何实现一个new"><a href="#27-如何实现一个new" class="headerlink" title="27. 如何实现一个new"></a>27. 如何实现一个new</h5><h5 id="28-new-这个关键字干了什么"><a href="#28-new-这个关键字干了什么" class="headerlink" title="28. new 这个关键字干了什么"></a>28. new 这个关键字干了什么</h5><h5 id="29-call-apply-bind-的区别"><a href="#29-call-apply-bind-的区别" class="headerlink" title="29. call, apply, bind 的区别"></a>29. call, apply, bind 的区别</h5><h5 id="30-强缓存，协商缓存"><a href="#30-强缓存，协商缓存" class="headerlink" title="30. 强缓存，协商缓存"></a>30. 强缓存，协商缓存</h5><h5 id="31-阻止冒泡，阻止事件捕获"><a href="#31-阻止冒泡，阻止事件捕获" class="headerlink" title="31. 阻止冒泡，阻止事件捕获"></a>31. 阻止冒泡，阻止事件捕获</h5><h5 id="32-高阶函数HOF"><a href="#32-高阶函数HOF" class="headerlink" title="32. 高阶函数HOF"></a>32. 高阶函数HOF</h5><h5 id="33-ES6新特性用过哪些"><a href="#33-ES6新特性用过哪些" class="headerlink" title="33. ES6新特性用过哪些"></a>33. ES6新特性用过哪些</h5><h5 id="34-如何判断是否是对象和数组"><a href="#34-如何判断是否是对象和数组" class="headerlink" title="34. 如何判断是否是对象和数组"></a>34. 如何判断是否是对象和数组</h5><h5 id="35-怎样同步调用接口"><a href="#35-怎样同步调用接口" class="headerlink" title="35. 怎样同步调用接口"></a>35. 怎样同步调用接口</h5><h5 id="36-新api：-pushState、bom"><a href="#36-新api：-pushState、bom" class="headerlink" title="36. 新api： pushState、bom"></a>36. 新api： pushState、bom</h5><h5 id="37-websocket与轮询区别"><a href="#37-websocket与轮询区别" class="headerlink" title="37. websocket与轮询区别"></a>37. websocket与轮询区别</h5><script type="text/javascript" src="https://cdn.jsdelivr.net/npm/kity@2.0.4/dist/kity.min.js"></script><script type="text/javascript" src="https://cdn.jsdelivr.net/npm/kityminder-core@1.4.50/dist/kityminder.core.min.js"></script><script defer="true" type="text/javascript" src="https://cdn.jsdelivr.net/npm/hexo-simple-mindmap@0.6.0/dist/mindmap.min.js"></script><link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/npm/hexo-simple-mindmap@0.6.0/dist/mindmap.min.css"> 
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  href="https://cdn.jsdelivr.net/npm/jquery-modal@0.9.2/jquery.modal.min.css"
/>
<script src="https://cdn.jsdelivr.net/npm/justifiedGallery@3.7.0/dist/js/jquery.justifiedGallery.min.js"></script>

<script src="/dist/main.js"></script>

<!-- ImageViewer -->
 <!-- Root element of PhotoSwipe. Must have class pswp. -->
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">

    <!-- Background of PhotoSwipe. 
         It's a separate element as animating opacity is faster than rgba(). -->
    <div class="pswp__bg"></div>

    <!-- Slides wrapper with overflow:hidden. -->
    <div class="pswp__scroll-wrap">

        <!-- Container that holds slides. 
            PhotoSwipe keeps only 3 of them in the DOM to save memory.
            Don't modify these 3 pswp__item elements, data is added later on. -->
        <div class="pswp__container">
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
            <div class="pswp__item"></div>
        </div>

        <!-- Default (PhotoSwipeUI_Default) interface on top of sliding area. Can be changed. -->
        <div class="pswp__ui pswp__ui--hidden">

            <div class="pswp__top-bar">

                <!--  Controls are self-explanatory. Order can be changed. -->

                <div class="pswp__counter"></div>

                <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>

                <button class="pswp__button pswp__button--share" style="display:none" title="Share"></button>

                <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>

                <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>

                <!-- Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR -->
                <!-- element will get class pswp__preloader--active when preloader is running -->
                <div class="pswp__preloader">
                    <div class="pswp__preloader__icn">
                        <div class="pswp__preloader__cut">
                            <div class="pswp__preloader__donut"></div>
                        </div>
                    </div>
                </div>
            </div>

            <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
                <div class="pswp__share-tooltip"></div>
            </div>

            <button class="pswp__button pswp__button--arrow--left" title="Previous (arrow left)">
            </button>

            <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
            </button>

            <div class="pswp__caption">
                <div class="pswp__caption__center"></div>
            </div>

        </div>

    </div>

</div>

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe.min.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/default-skin/default-skin.min.css">
<script src="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe-ui-default.min.js"></script>

<script>
    function viewer_init() {
        let pswpElement = document.querySelectorAll('.pswp')[0];
        let $imgArr = document.querySelectorAll(('.article-entry img:not(.reward-img)'))

        $imgArr.forEach(($em, i) => {
            $em.onclick = () => {
                // slider展开状态
                // todo: 这样不好，后面改成状态
                if (document.querySelector('.left-col.show')) return
                let items = []
                $imgArr.forEach(($em2, i2) => {
                    let img = $em2.getAttribute('data-idx', i2)
                    let src = $em2.getAttribute('data-target') || $em2.getAttribute('src')
                    let title = $em2.getAttribute('alt')
                    // 获得原图尺寸
                    const image = new Image()
                    image.src = src
                    items.push({
                        src: src,
                        w: image.width || $em2.width,
                        h: image.height || $em2.height,
                        title: title
                    })
                })
                var gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, {
                    index: parseInt(i)
                });
                gallery.init()
            }
        })
    }
    viewer_init()
</script> 
<!-- MathJax -->

<!-- Katex -->

<!-- busuanzi  -->
 
<script src="/js/busuanzi-2.3.pure.min.js"></script>
 
<!-- ClickLove -->

<!-- ClickBoom1 -->

<!-- ClickBoom2 -->

<!-- CodeCopy -->
 
<link rel="stylesheet" href="/css/clipboard.css">
 <script src="https://cdn.jsdelivr.net/npm/clipboard@2/dist/clipboard.min.js"></script>
<script>
  function wait(callback, seconds) {
    var timelag = null;
    timelag = window.setTimeout(callback, seconds);
  }
  !function (e, t, a) {
    var initCopyCode = function(){
      var copyHtml = '';
      copyHtml += '<button class="btn-copy" data-clipboard-snippet="">';
      copyHtml += '<i class="ri-file-copy-2-line"></i><span>COPY</span>';
      copyHtml += '</button>';
      $(".highlight .code pre").before(copyHtml);
      $(".article pre code").before(copyHtml);
      var clipboard = new ClipboardJS('.btn-copy', {
        target: function(trigger) {
          return trigger.nextElementSibling;
        }
      });
      clipboard.on('success', function(e) {
        let $btn = $(e.trigger);
        $btn.addClass('copied');
        let $icon = $($btn.find('i'));
        $icon.removeClass('ri-file-copy-2-line');
        $icon.addClass('ri-checkbox-circle-line');
        let $span = $($btn.find('span'));
        $span[0].innerText = 'COPIED';
        
        wait(function () { // 等待两秒钟后恢复
          $icon.removeClass('ri-checkbox-circle-line');
          $icon.addClass('ri-file-copy-2-line');
          $span[0].innerText = 'COPY';
        }, 2000);
      });
      clipboard.on('error', function(e) {
        e.clearSelection();
        let $btn = $(e.trigger);
        $btn.addClass('copy-failed');
        let $icon = $($btn.find('i'));
        $icon.removeClass('ri-file-copy-2-line');
        $icon.addClass('ri-time-line');
        let $span = $($btn.find('span'));
        $span[0].innerText = 'COPY FAILED';
        
        wait(function () { // 等待两秒钟后恢复
          $icon.removeClass('ri-time-line');
          $icon.addClass('ri-file-copy-2-line');
          $span[0].innerText = 'COPY';
        }, 2000);
      });
    }
    initCopyCode();
  }(window, document);
</script>
 
<!-- CanvasBackground -->

<script>
  if (window.mermaid) {
    mermaid.initialize({ theme: "forest" });
  }
</script>


    
    

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